That Taylor Swift — she always has a surprise up her fluttery sleeves. On April 12, she startled fans by nonchalantly posting on Instagram that she’d be dropping an unexpected cover single on Spotify, along with an alternate version of “Delicate.”

Swift tends to be selective with her recorded cover songs, so any one she decides upon would be an event. However, she went right for the top of the classics heap, opting to tackle one of the most recognizable soul-funk jams in history: Earth, Wind & Fire’s “September.”